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PH Meter reminder !

Discussion in 'Hydroponics / Aeroponics' started by Niblixdark, Oct 2, 2017.

  1.  
    Niblixdark

    Niblixdark Well-Known Member

    Just a friendly reminder for us hydroponic guys especially, remember to recalibrate your PH meter. Preferably every couple weeks.

    Especially when going into mid flowering!

    :wall:
     
  2.  
    nxsov180db

    nxsov180db Well-Known Member

    I must admit I let it go to long as well recently :-?
     
    Niblixdark likes this.
  3.  
    Organic Miner

    Organic Miner Well-Known Member

    You know I started recalibrating every 2 weeks in the beginning, but found it wasn’t necessary because it was spot on. Maybe it was my environment. Definitely checked it at the beginning of each run, both veg and flower. Doesn’t hurt to check more often than less.
     
    Niblixdark likes this.
  4.  
    nxsov180db

    nxsov180db Well-Known Member

    Are you talking about checking PH or calibrating the PH metering device?
     
  5.  
    Niblixdark

    Niblixdark Well-Known Member

    meter me thinks.. Lol

    I leave the ph probe in the res and it drifts off a little bitty bit every month, maybe from air stones or 9v battery vs power plug. No idea but they do drift off eventually !
     
    Last edited: Oct 2, 2017
  6.  
    Organic Miner

    Organic Miner Well-Known Member

    Lol, I was talking about the meter. I check the pH continuously.
     
    Niblixdark likes this.
  7.  
    gribniff

    gribniff Member

    Ok, guess I'm the anal one.

    I calibrate EVERY SINGLE TIME something goes into the pots.
    Used to do it bout once a week.

    Hate being taught a lesson!
    Pen decided, overnight, that 7.0 is 6.1

    No, did not keep the pieces.
     
    Xs121 and Niblixdark like this.
  8.  
    coreywebster

    coreywebster Well-Known Member

    Think I have been lucky with mine, its gone a year at times and every time I do calibrate it its bang on where it should be.
    Its only an essentials pen too, which are mid range.
     
    Niblixdark likes this.
  9.  
    dbkick

    dbkick Well-Known Member

    Unless the meter/probe is cheap af it isn't that critical. A bluelab guardian flashes a light every 30 days to remind you to calibrate. I've gone months and the meter ends up off by only .1 or .2 .
     
    ChaosHunter likes this.
  10.  
    Tranesong

    Tranesong New Member

    After two cheap PH meters I HAD to break down a by a $100 HM lab model. That said, I didn't know previously how to care for the electrodes when in storage, cleaning etc. My nute formula relies on perfect PH. Now my reading are finally correct after 6 weeks. My plants are growing but showing sign of nutrient dif. Three meters inn six weeks. Damn.
     
  11.  
    Niblixdark

    Niblixdark Well-Known Member

    Nutradip probes work great for me I've had mine for years now. You can plug it in or use a 9v for mobility.
     
  12.  
    FennarioMike

    FennarioMike Well-Known Member

    I went to school for water treatment engineering and pH probe calibration and maintenance was drilled into us.

    The meter works by an ion exchange through the glass tip. There's a tiny ceramic embedded in the glass that allows ions to flow in and out of the probe. The glass is full of KCl solution and each time that it's immersed in solution, some of that KCL is lost through diffusion - at the same time osmosis pulls water into the probe. This change in KCl since the last calibration is what causes drift. Using the KCl storage solution will recondition the probe by "recharging" the inside of the glass.

    Never leave a probe in RO or DI water for a long period of time - it will strip out the KCl completely, probably rendering the meter useless. There are a handful of practices that will keep your probe lasting a very long time.

    There's also good technique to getting a consistently accurate calibration. Your meter will only be as accurate as your technique. If you contaminate your standard solutions, then your calibration will be off - even though it completes the calibration. You're telling it what 4 and 7 pH look like - if your 4 and 7 solutions are no longer 4.0 and 7.0 - then you're mis-calibrating the meter.

    Always rinse your probe and sample container with the solution to be tested, discard - then fill the sample container and take a reading. You're rinsing off things that might skew your pH. Like - if you take your probe out of 7.0 solution and dip it into the 4 - well, now the 4 is no longer really 4... Also, never pour solution back into the bottle. Once it has left the container, consider it contaminated.

    Always do a 2 point calibration with both 4 and 7 - then it will be accurate between those points. The further away from 4 or 7 that your reading is, the less and less accurate it becomes. If you only calibrated with 1 solution then it would literally only be accurate at that single point.

    It's a good idea to do all of these things - AND recalibrate at least monthly. New bottles of standard solutions are a whole lot cheaper than sick plants.
     
    HydroRed and natureboygrower like this.
  13.  
    Tranesong

    Tranesong New Member

    Exactly. Thanks Fennario.
     
  14.  
    firsttimeARE

    firsttimeARE Well-Known Member

    My bluelab combo goes off every 2 weeks but its always on point when I recalibrate.

    I let it ride for 3-4 weeks
     
  15.  
    FennarioMike

    FennarioMike Well-Known Member

    Let it soak for 24 hours in a container of KCl solution - then recalibrate. It will likely stay in cal better.
     
    TCH and firsttimeARE like this.
  16.  
    firsttimeARE

    firsttimeARE Well-Known Member

    It stays in KCl all the time when its not in use.
     
  17.  
    Flash63

    Flash63 Well-Known Member

    I never have to calibrate. 84E9D149-B03A-4F63-BA0B-8425EDCAFC08.jpeg
     
  18.  
    FennarioMike

    FennarioMike Well-Known Member

    That's weird that it drifts like that. I have the blue labs guardian - I think that's the model... It stays in the rez 24/7 and monthly I do a 24 hr recharge with KCl, recalibrate - and back in the rez. I've been using this one for about a year and so far so good. It reminds me monthly to recalibrate. Since I use it 24/7 it will probably shorten it's life - but I can just replace the probe itself.
     
  19.  
    firsttimeARE

    firsttimeARE Well-Known Member

    Think you misred that. The meter itself goes off after 2 weeks (when you calibrate it you get an icon that reminds you that its calibrated or needs calibration) that icon goes awya after 2 weeks.

    Meter is calibrated still tho, but I do it once a month to be sure and its usually 0.1 at most off after that point
     
  20.  
    frontline

    frontline Active Member

    I agree,spent lots of money and lots of time with fancy meters.Not now
     

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